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3 CHA PAGE ITRE 3 24 Recovery from a domestic refrigerator It is possible to recover refrigerant from a hermetically sealed system, which has no service valve. A line-tap valve (piercing valve) should be fitted to the system, and a recovery unit used to remove the refrigerant from the unit via the line-tap as with the larger system. Line-tap valves should never be left permanently in place, but removed after use if placed on the process tube (if the equipment is going for disposal). Because of the small charge of refrigerant, only vapour recovery is needed. It is recommended to install tap-valves on both and low pressure side, as shown here: Recovery from commercial cold room system Liquid transfer Connect the recovery cylinder’s hose to the system’s outlet stop valve on the condenser/receiver. To control liquid flow, install a sight glass to the hose and cylinder. From the recovery cylinder’s vapour side, use a drier. Outlet/discharge side of the recovery unit goes to the system’s high-pressure side at the inlet condenser or compressor high-pressure stop valve. All of the system’s stop valves have to be opened, including the solenoid valves. Run the recovery unit and keep an eye on the sight glass. When there is no more liquid transferred through the sight glass, and there is no icing left on the compressor shell, on the receiver or anywhere else, this indicates there is negligible amounts of refrigerant left in the system. Vapour transfer When liquid transfer is completed, connect the hoses from the recovery unit suction/inlet side to the compressor low or high- pressure side. For better recovery, connect hoses to both the high and low pressure sides using a service manifold. The recovery discharge/outlet side should be connected to the recovery cylinder’s vapour side. Be sure that all service/shut off valves are open to avoid “locking” refrigerant into the system. Recovery from a domestic refrigerator 81 P Refrigerant ManagementPDF Image | Manual for Refrigeration Servicing Technicians
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